Matthew Naquin, convicted of negligent homicide in the 2017 hazing death of LSU freshman Max Gruver, received the maximum sentence of five years in prison. The judge suspended half of it.
Judge Beau Higginbotham previously sentenced two others involved in the death to the maximum sentence.
Gruver died of alcohol poisoning during a Phi Delta Theta fraternity ritual members called "bible study." Pledges were quizzed on their knowledge of the fraternity's history, and would be required to drink depending on their answers.
Authorities say Gruver blood-alcohol content was 0.495, more than six times the legal limit in Louisiana for driving. A blood-alcohol content of 0.4 proves fatal for about half of the adults who reach that level of intoxication.